Patent US2563777A successfully refreshed from Google Patents.
US2563777A
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Radio beacon simulating system
Assignee: Engineering & Res Corp
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Filing: 1949-10-26
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Granted: 1951-08-07
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Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Michael C Ellison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:59
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2444477A
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US2452038A
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US2454503A
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US2494566A
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US2485435A
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US2429597A
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US2510385A
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US2492964A
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US2460877A
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US2475600A
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US2499990A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |